obbligato

adjective

1. (used as a musical direction) obligatory or indispensable; so important that it cannot be omitted.

noun, plural ob·bli·ga·tos, ob·bli·ga·ti [ob-li-gah-tee; Italian awb-blee-gah-tee] /ˌɒb lɪˈgɑ ti; Italian ˌɔb bliˈgɑ ti/.

2. an obbligato part or accompaniment.
3. a continuing or persistent subordinate or background motif.
4. a subordinate part of a solo.

adjective

1. not to be omitted in performance

noun plural -tos or -ti (-tiː)

2. an essential part in a scorewith oboe obbligato

adj.musical instruction, 1724, from Italian obbligato, literally “obligated,” from Latin obligatus, past participle of obligare “to bind” (see oblige). In reference to a necessary accompaniment by a single instrument.